Original Caterpillar 525B & 535B Skidder Electrical Schematics Fold-out . Machine serial #’s : AAE1-457 , 3KZ1-305 . Form # RENR4343-01 , issued 2002 . In good overall condition , edge smudging , fold-out clean . Free Standard Letter shipping US & Canada – no tracking number . Worldwide shipping via International Letter Mail – no tracking number . Expedited mailing with a tracking number is available – email for cost .